Valve



(No Model.)

J. D. BOWMAN.

VALVE.

Patented June 10, 1890.

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ya? m f- UNITED STATES PATENT OFFICE.

JOHN D. BOWMAN, OF ALTOONA, PENNSYLVANIA.

VALVE.

SPECIFICATION forming part of Letters Patent No. 429,881, dated June 10, 1890.

Application filed January 23, 1889. Serial No. 297,286. (No model.)

To all whom it may concern:

Be it known that I, JOHN D. BOWMAN, of Altoona, county of Blair, State of Pennsylvania, have invented a new and useful Improvement in Valves, of which the following is a true and exact description, reference being had to the accompanying drawings, which form. a part of this specification.

My invention relates to the construction of valves, and is especially intended for use with the needle-valves employed to control the fiow of carbureted air or gas in those systems of railway-car lighting in which gas is employed. Obviously, however, my device is capable of use in many other connections.

The object of my invention is to avoid the use of stuffing-box glands or similar devices, and to so arrange the actuating-rod of the valve as to prevent leakage around it.

The leading features of my device consist of a valve-casing, a valve having a short stem entirely inclosed in the casing, and having only longitudinal motion therein, a valveactuating rod so connected with the valvestem as to give it longitudinalmotion, and having a projection upon its stem formed to fit tightly with a seat on the inside of the cap of the casing, and a spring inclosed in the casing, so as to act to press the actuating-rod outward.

An important additional feature which I prefer to employ consists in inserting the spring between the valve-stern and the actuating-rod, so that as the valve opens it will press with increased force against said rod.

The novel features of my invention are hereinafter clearly pointed out in the claim, and will be best understood after adescription of the device as it is shown in the drawings,which represent my invention embodied in what I believe to be its best form, and in which Figure 1 is a central sectional elevation showing my improvement in its said preferred form, and Fig. 2 a cross-section on the line 0c 00 of Fig. 1.

A is the valve-casing, to which the conduitpipes are attached intheusual way at A and A the gas passing from A through a, thence to a, and thence through A The portion of the valve-casinglyingbelow thepassage a,through which the gas passes to the interior of the chamber, is threaded, as is shown at A. Below this threaded portion the chamber of the casing is enlarged, as is shown at A, the lower end of this enlarged opening being threaded, as is shown at A to receive the threaded end 0 of the cap 0, which said cap is centrally perforated, as is shown at O to permit the valve-key to pass through it, the upper portion of said perforation being formed into a seat 0 p B is the valve, the stem of which is threaded, as is shown at B, and screwed into the thread A of the casing. Below the threaded portion of the valve-stem it terminates in a shank B which may be of any convenient shape in cross-section, except round. Preferably I form a flange B on the valve-stem above the shank B D is the valve-key, the upper end of which must be formed so as to engage the shank of the valve-stem and turn with it without interfering with its longitudinal motion. On this key is a flange D and below the flange a face D is formed on the key, which fits and forms a tight joint with the seat C of cap (7. Below the face D extends the shank D of the key, the end of which is squared off at D and terminates in a screw D E is the handle by which the valve-key is turned. It has a square perforation E, which fits on the square perforation D of the key, and is held in place by a nut F screwing on the end D of the key. To prevent chattering I use a washer G, of leather or other soft material, which is placed between the handle E and the end of the cap O, as shown.

H is a spring, which is placed inside of the valve-casing, resting at one end on the flange D of the valve-key, and preferably resting at its other end against the flange B of the valve-stem. If this flange B be omitted, the upper end of the spring can rest against the shoulder A of the valve-casing, although, for reasons which I will hereinafter give, it is very much better to secure the spring between the two flanges B and D as shown in the drawings.

The operation of my device is as follows: The parts being put together, as shown in the drawings, it is evident that by turningthe key D the valve-stem will be compelled to turn with IOO it, and in turning will, by reason of its screwconnection with the valve-casing, advance or recede from its seat in the passage a. The key D will have no longitudinal motion,and itsface D will be constantly held on the scat C by the pressure of the spring Il. \Vhere, as in the modified form suggested by me, the spring H extends to the shoulder A its pressure is constant; but when the spring is clamped bc tween the shoulders B" and D as shown in the drawings, it is compressed whenever the valve is opened, and the more gas that is allowed to pass through the chamber the tighter the face 1) of the Valve-key is pressed against the seat 0 in the cap, and the less danger there is of the escape of the gas around the key.

The function of the washer G is to prevent chattering and noise, which it does by keeping all of the parts pressed together with sufficient force to prevent their rattling on each other without oifering an y material frictional resistance to the turning of the handle.

Having now described my invention,what I claim as new, and desire to secure by Letters Patent, is

In combination with a chambered valvecasing, a valve having a stem with an angular shank 3 and a flange B, fitting the interior of the chamber, a chambered cap for the casing, a valve-actuating key extending through the cap and having a cylindrical head recessed to fit the valve-stem shank and havin a flange D fitting the interior of the chamber, a seat in the end of the chamber, and a projection on the key beyond the flange eonforming to said seat, a spring seated in the annular space between the head and the walls of the chamber and reacting between the flanges B and D a handle on the key-actuating rod, and a washer interposed between the handle and the end of the cap.

JOHN D. BO\VMAN.

\Vitnesses:

R. A. FRAKER, E. M. PROSSER. 

